The cold model study on the decarburization rate in oxygen steelmaking processes by CO2-KOH system.

Zong, Jin-Ho; Park, Hyung-Kyu; Yoon, Jong-Kyu

doi:10.2355/isijinternational.30.748

Cited by 4 publications

(4 citation statements)

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“…The bubble surface area for unit volume, A, is a function of bubble size (d b ) and gas fraction (a g ): [17,30,31] A ¼ 6a g d b ½28…”

Section: B Hypothesis and Basic Equationsmentioning

confidence: 99%

“…(1) Equation [30] is assumed valid for two-phase mixtures. Therefore, the terminal velocity of an isolated bubble (v ¥ ) and the drag coefficient for infinite liquid (C D¥ ) are replaced by the slip velocity of the system (v s ) and by the drag coefficient for two-phase media (C D ), respectively.…”

Section: Characteristic Bubble Diameter Calculation D Bmentioning

confidence: 99%

“…30 2 portion can be related to the activity of oxygen or sulfur according to the Lagmuir adsorption isotherm: [1,4,49] ð1 À uÞ ¼…”

Section: Authormentioning

confidence: 99%

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Gas-Liquid Reaction Model in Gas-Stirred Systems: Part 1. Numerical Model

Venturini

Goldschmit

2007

Metall Mater Trans B

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A finite-element turbulent model for the fluid-dynamic and the interfacial mass transfer in gasstirred ladles was developed. The model is based on a dispersed two-phase Eulerian-Eulerian approach and constructs the gas-phase velocity as the liquid velocity plus a gas-liquid slip velocity. In this work, such slip velocity is calculated in terms of the so called ''drift flux model.'' The model is able to describe both desgasification and gas absorption processes in liquid steel systems. The influence of different chemical species was taken into account. Validation was made using experimental data obtained from the literature. These data came from two sources: laboratory and industrial scale tests. The presented model can simulate the turbulent flow pattern and the gas-liquid mass transfer with reasonable accuracy.

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“…The bubble surface area for unit volume, A, is a function of bubble size (d b ) and gas fraction (a g ): [17,30,31] A ¼ 6a g d b ½28…”

Section: B Hypothesis and Basic Equationsmentioning

confidence: 99%

Section: Characteristic Bubble Diameter Calculation D Bmentioning

confidence: 99%

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Gas-Liquid Reaction Model in Gas-Stirred Systems: Part 1. Numerical Model

Venturini

Goldschmit

2007

Metall Mater Trans B

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“…The popular reaction used for the reactor design of the gas/liquid reaction system is the fast pseudo firstorder reaction and KOHIG02 model system is widely used for that reaction because of its easiness of treatment and analysis.4, [10][11][12][13] The determination of the model system and the choice oi' experimental condi- tions have been investigated rigorously in the research work of Yoon et al 14) The reaction regime for the fast pseudo first-order reaction can be classified by some dimensionless vari-ables9) which influence the rate ofgas absorption, such…”

Section: Measurementof Gas/liquid Hterfacial Areamentioning

confidence: 99%

The effect of the gas jet on the gas/liquid reactivity in the metallurgical vessel.

1991

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The eftect of the turbulent gas jet on the reaction characteristics in gas blowing was investigated by the simultaneous measurements of gas/liquid interfacial area and gas holdup. Gas/Iiquid interfacial area was measuredby KOHIC02 model system on the fast pseudo first-order reaction, and gas holdup was measuredby using the electrical conductivity method. By estimating the mean diameter of bubbles from the measureddata of gas/liquid interfacial area and gas holdup, in the gas/Iiquid two phase region, the jet etfect on the improvementof the reactivity was investigated.Both the specific interfacial area and the gas holdup were increased as the aspect ratio decreased. The variations were larger in a high gas flow rate and in a small nozzle diameter. The eftect of nozzle diameter was larger in a low aspect ratio.The calculated mean diameter of bubbles was slightly increased with the increase of the nozzle diameter and the aspect ratio. The result showsthat the increase in the reacting interfacial area according to the development of jet was mainly affected by the increase of gas holdup through being dense of bubble swarms in the jet.

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